Stroller frame



FIG. 1 is a rear perspective view of our new design with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a rear perspective view thereof, identical to FIG. 1 but with the dashed lines removed (except for the wheels) for the sake of clarity. 

The ornamental design for a stroller frame, as shown and described. 